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Condensed Consolidated Statements Of Changes In Stockholders' Equity (USD $)
Class A Common Stock [Member]
Class B Common Stock [Member]
Paid-In Capital In Excess Of Par Value [Member]
Retained Earnings [Member]
Total
Balance at Sep. 28, 2013 $ 671,899us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 466,090us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 77,186,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 332,315,037us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 410,639,275us-gaap_StockholdersEquity
Balance (in shares) at Sep. 28, 2013 13,437,975us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 9,321,801us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		      
Net income       9,533,129us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 9,533,129us-gaap_NetIncomeLoss
Cash dividends       (3,615,547)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (3,615,547)us-gaap_DividendsCommonStockCash
Common stock conversions 133us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 (133)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		      
Common stock conversions (in shares) 2,662us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 (2,662)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		      
Balance at Dec. 28, 2013 672,032us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 465,957us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 77,186,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 338,232,619us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 416,556,857us-gaap_StockholdersEquity
Balance (in shares) at Dec. 28, 2013 13,440,637us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 9,319,139us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		      
Balance at Sep. 27, 2014 677,017us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 335,972us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 12,311,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 369,277,929us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 382,602,167us-gaap_StockholdersEquity
Balance (in shares) at Sep. 27, 2014 13,540,333us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 6,719,443us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		      
Net income       15,038,338us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 15,038,338us-gaap_NetIncomeLoss
Cash dividends       (3,243,072)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (3,243,072)us-gaap_DividendsCommonStockCash
Common stock conversions 655us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 (655)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		      
Common stock conversions (in shares) 13,100us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 (13,100)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		      
Balance at Dec. 27, 2014 $ 677,672us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 335,317us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 12,311,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 381,073,195us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 394,397,433us-gaap_StockholdersEquity
Balance (in shares) at Dec. 27, 2014 13,553,433us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 6,706,343us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember